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<p>CAEmitterLayer是一个高性能的粒子引擎，被用来创建实时例子动画如：烟雾，火，雪花，雨，爆炸等等这些效果。</p>
<h4 id="一、粒子发送器图层"><a href="#一、粒子发送器图层" class="headerlink" title="一、粒子发送器图层"></a>一、粒子发送器图层</h4><p>粒子的常用属性</p>
<ul>
<li>birthRate：每秒发送（出生）粒子的数量</li>
</ul>
<blockquote>
<ul>
<li>emitterMode：发送的样式<ul>
<li>kCAEmitterLayerPoints：点</li>
<li>kCAEmitterLayerOutline：线</li>
<li>kCAEmitterLayerSurface：面</li>
<li>kCAEmitterLayerVolume：团</li>
</ul>
</li>
<li>emitterShape：发送形状的样式<ul>
<li>kCAEmitterLayerPoint：点</li>
<li>kCAEmitterLayerLine：线</li>
<li>kCAEmitterLayerRectangle：矩形</li>
<li>kCAEmitterLayerCuboid：立方体</li>
<li>kCAEmitterLayerCircle：曲线</li>
<li>kCAEmitterLayerSphere：圆形</li>
</ul>
</li>
<li>renderMode：粒子出现的样式<ul>
<li>kCAEmitterLayerOldestFirst：最后出生的粒子，在第一个</li>
<li>kCAEmitterLayerOldestLast：最后出生的粒子，在最后面</li>
<li>kCAEmitterLayerBackToFront：把后面的粒子放到上面</li>
<li>kCAEmitterLayerAdditive：叠加</li>
</ul>
</li>
</ul>
</blockquote>
<ul>
<li>emitterCells：在粒子发送器上面添加粒子</li>
</ul>
<p><code>CAEmitterCell：粒子</code></p>
<blockquote>
<p>contents：粒子的内容</p>
<p>lifetime：存活的时间</p>
<p>lifetimeRange：存活时间的范围</p>
<p>birthRate：每秒粒子生成的数量</p>
<p>emissionLatitude：散发的纬度（方向：上下）-&gt;弧度</p>
<p>emissionLongitude：散发的经度（方向：左右）-&gt;弧度</p>
<p>emissionRange：散发的范围 -&gt; 弧度</p>
<p>velocity：发送的速度（速度越快，跑的越远）</p>
<p>velocityRange：发送速度的范围</p>
<p>xAcceleration：X轴的加速度</p>
<p>yAcceleration：Y轴的加速度</p>
<p>zAcceleration：Z轴的加速度</p>
<p>name：粒子的名字。可以通过名字，找到粒子</p>
</blockquote>
<p>下雪</p>
<figure class="highlight objectivec"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//雪花动画</span></span><br><span class="line">- (<span class="type">void</span>)animation1 &#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//粒子发射器</span></span><br><span class="line">    <span class="built_in">CAEmitterLayer</span> *snowEmitter = [<span class="built_in">CAEmitterLayer</span> layer];</span><br><span class="line">    <span class="comment">//粒子发射的位置</span></span><br><span class="line">    snowEmitter.emitterPosition = <span class="built_in">CGPointMake</span>(<span class="number">100</span>, <span class="number">30</span>);</span><br><span class="line">    <span class="comment">//发射源的大小</span></span><br><span class="line">    snowEmitter.emitterSize        = <span class="built_in">CGSizeMake</span>(<span class="keyword">self</span>.view.bounds.size.width, <span class="number">0.0</span>);;</span><br><span class="line">    <span class="comment">//发射模式</span></span><br><span class="line">    snowEmitter.emitterMode        = kCAEmitterLayerOutline;</span><br><span class="line">    <span class="comment">//发射源的形状</span></span><br><span class="line">    snowEmitter.emitterShape    = kCAEmitterLayerLine;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//创建雪花粒子</span></span><br><span class="line">    <span class="built_in">CAEmitterCell</span> *snowflake = [<span class="built_in">CAEmitterCell</span> emitterCell];</span><br><span class="line">    <span class="comment">//粒子的名称</span></span><br><span class="line">    snowflake.name = <span class="string">@&quot;snow&quot;</span>;</span><br><span class="line">    <span class="comment">//粒子参数的速度乘数因子。越大出现的越快</span></span><br><span class="line">    snowflake.birthRate        = <span class="number">1.0</span>;</span><br><span class="line">    <span class="comment">//存活时间</span></span><br><span class="line">    snowflake.lifetime        = <span class="number">120.0</span>;</span><br><span class="line">    <span class="comment">//粒子速度</span></span><br><span class="line">    snowflake.velocity        = <span class="number">-10</span>;                <span class="comment">// falling down slowly</span></span><br><span class="line">    <span class="comment">//粒子速度范围</span></span><br><span class="line">    snowflake.velocityRange = <span class="number">10</span>;</span><br><span class="line">    <span class="comment">//粒子y方向的加速度分量</span></span><br><span class="line">    snowflake.yAcceleration = <span class="number">2</span>;</span><br><span class="line">      <span class="comment">//周围发射角度</span></span><br><span class="line">    snowflake.emissionRange = <span class="number">0.5</span> * M_PI;        <span class="comment">// some variation in angle</span></span><br><span class="line">    <span class="comment">//子旋转角度范围</span></span><br><span class="line">    snowflake.spinRange        = <span class="number">0.25</span> * M_PI;        <span class="comment">// slow spin</span></span><br><span class="line">    <span class="comment">//粒子图片</span></span><br><span class="line">    snowflake.contents        = (<span class="type">id</span>) [[<span class="built_in">UIImage</span> imageNamed:<span class="string">@&quot;DazFlake&quot;</span>] <span class="built_in">CGImage</span>];</span><br><span class="line">    <span class="comment">//粒子颜色</span></span><br><span class="line">    snowflake.color            = [[<span class="built_in">UIColor</span> redColor] <span class="built_in">CGColor</span>];</span><br><span class="line"></span><br><span class="line">    <span class="comment">//设置阴影</span></span><br><span class="line">    snowEmitter.shadowOpacity = <span class="number">1.0</span>;</span><br><span class="line">    snowEmitter.shadowRadius  = <span class="number">0.0</span>;</span><br><span class="line">    snowEmitter.shadowOffset  = <span class="built_in">CGSizeMake</span>(<span class="number">0.0</span>, <span class="number">1.0</span>);</span><br><span class="line">    snowEmitter.shadowColor   = [[<span class="built_in">UIColor</span> whiteColor] <span class="built_in">CGColor</span>];</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 将粒子添加到粒子发射器上</span></span><br><span class="line">    snowEmitter.emitterCells = [<span class="built_in">NSArray</span> arrayWithObject:snowflake];</span><br><span class="line">    [<span class="keyword">self</span>.view.layer insertSublayer:snowEmitter atIndex:<span class="number">0</span>];</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



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</div></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">kyren</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="http://huluo666.gitee.io/2016/04/12/iOS绘图与动画系列-粒子效果（六）/">http://huluo666.gitee.io/2016/04/12/iOS绘图与动画系列-粒子效果（六）/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a target="_blank" rel="noopener" href="https://creativecommons.org/licenses/by-nc-sa/4.0/">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="http://huluo666.gitee.io">Kyren's Blog</a>！</span></div></div><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/iOS-%E5%8A%A8%E7%94%BB-%E7%BB%98%E5%9B%BE/">iOS,动画,绘图</a></div><nav id="pagination"><div class="prev-post pull-left"><a href="/2016/04/12/CocoaPods%E5%AE%89%E8%A3%85%E5%92%8C%E4%BD%BF%E7%94%A8%E6%95%99%E7%A8%8B/"><i class="fa fa-chevron-left">  </i><span>CocoaPods安装和使用教程</span></a></div><div class="next-post pull-right"><a href="/2016/04/12/iOS%20%E5%A4%9A%E8%AF%AD%E8%A8%80%E6%9C%AC%E5%9C%B0%E5%8C%96/"><span>iOS 多语言本地化</span><i class="fa fa-chevron-right"></i></a></div></nav></div></div><footer><div class="layout" id="footer"><div class="copyright">&copy;2022 By kyren</div><div class="framework-info"><span>驱动 - </span><a target="_blank" rel="noopener" href="http://hexo.io"><span>Hexo</span></a><span class="footer-separator">|</span><span>主题 - </span><a target="_blank" rel="noopener" href="https://github.com/Molunerfinn/hexo-theme-melody"><span>Melody</span></a></div><div class="footer_custom_text">hitokoto</div><div class="busuanzi"><script async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><span id="busuanzi_container_page_pv"><i class="fa fa-file"></i><span id="busuanzi_value_page_pv"></span><span></span></span></div></div></footer><i class="fa fa-arrow-up" id="go-up" aria-hidden="true"></i><script src="https://cdn.jsdelivr.net/npm/animejs@latest/lib/anime.min.js"></script><script src="https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js"></script><script src="https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-animate@latest/velocity.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-ui-pack@latest/velocity.ui.min.js"></script><script src="/js/utils.js?version=1.9.0"></script><script src="/js/fancybox.js?version=1.9.0"></script><script src="/js/sidebar.js?version=1.9.0"></script><script src="/js/copy.js?version=1.9.0"></script><script src="/js/fireworks.js?version=1.9.0"></script><script src="/js/transition.js?version=1.9.0"></script><script src="/js/scroll.js?version=1.9.0"></script><script src="/js/head.js?version=1.9.0"></script><script src="/js/search/local-search.js"></script><script>if(/Android|webOS|iPhone|iPod|iPad|BlackBerry/i.test(navigator.userAgent)) {
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